SEM images A–E Sinorachis baihu Wu & Chen, gen. and sp. nov. HBUMM08296-specimen 2, paratype: A radula, showing central tooth (arrowed) and several lateral teeth B radula, showing tricuspid lateral teeth C radula, showing most lateral part D embryonic shell E magnified embryonic shell, showing some pits F–G radula of Laeocathaica prionotropis Möllendorff, 1899, HBUMM08299-spec.1: F showing central tooth (arrowed) and nearby lateral teeth G marginal part of radula.